Preheat your oven to 400°F and line a baking sheet with parchment paper.
In a large skillet over medium heat, brown the lean ground beef until fully cooked, breaking it up as it cooks. Drain any excess grease if needed.
Stir in the undrained Rotel, taco seasoning, and frozen diced hashbrowns. Reduce the heat to low, cover, and cook for 7–8 minutes, or until the potatoes are tender. If the mixture looks dry at any point, add a small splash of water and stir.
Remove the skillet from heat and stir in 4 ounces of Colby Jack cheese until melted and evenly combined. Let the filling cool slightly so it’s easier to handle.
Cut the 3 large flour tortillas in half to create 6 half-moons.
Sprinkle a little Colby Jack cheese over each tortilla half. Spoon a portion of the beef mixture into the center of each piece.
Fold one side of the tortilla over the filling, then fold again to create a triangular pocket, similar to a crunchwrap-style fold.
Place each pocket seam-side down on the prepared baking sheet, arranging them with the pointed ends facing inward if you’d like to create a circle presentation.
Brush the tops generously with melted butter for that golden, crispy finish.
Bake for 15 minutes, or until the pockets are golden brown and crisp on top.
Remove from the oven and drizzle with taco sauce. Top with sour cream and pico de gallo before serving.